CN101550515B - Copper-containing high-strength and high-ductility high manganese steel - Google Patents
Copper-containing high-strength and high-ductility high manganese steel Download PDFInfo
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Abstract
The invention relates to copper-containing high-strength and high-ductility high manganese steel and a production method thereof. The copper-containing high-strength and high-ductility high manganese steel comprises the following components by the weight percent: 15-25 of Mn, 0.10-1.5 of Cu, 0.3-1.0 of C, 0.04-0.8 of Si, 0.002-0.8 of Al and the balance of Fe and impurities. The production method comprises the following steps: a casting blank is heated to the temperature of 0.7TL-0.8TL for thermostatic solution treatment within 3h; the casting blank is cooled by air or water at the start hot rolling temperature of 0.7TL-0.8TL and the final hot rolling temperature of 0.6TL-0.8TL, and the casting block is coiled at the temperature of 550-680 DEG C; a steel plate after being processed by hot rolling is processed by the annealing treatment at 300-900 DEG C; and the steel plate is cooled by air or water. The invention ensures that steel has high strength and ductility and is easy to be formed, smelted and cast.
Description
Technical field
The present invention relates to a kind of copper-containing high-strength high-ductility high manganese steel and method of manufacture, especially Fe-Mn-C is cupric high manganese TWIP steel and method of manufacture thereof.
Background technology
Twin crystal induction plastic (twinning induced plasticity; TWIP) the steel manganese content is high; Matrix is an austenite, in the process of viscous deformation, shows higher ductility and superior strength characteristics, is mainly used in the automotive field; Comprise that Fe-Mn-Si-Al system, Fe-Mn-C system, Fe-Mn-Al-C are (typical composition Fe-16Mn-11Al-1.1C), and superelevation carbon system (typical composition Fe-8Mn-13Al-7C) etc.
Fe-Mn-Si-Al is the TWIP steel, and typical composition is: C:＜0.2%, and Mn:10%～30%, Si:1%～6%, Al:1%～8%, Germany is to the research of this system high mangaenese steel level that is in a leading position.Because the Al constituent content is higher in the Fe-Mn-Si-Al series high-manganese steel, in sheet billet continuous casting or die casting process, segregation can take place at the crystal boundary place in Al usually when solidifying, form compound (Fe between low melting point metal
2Al
5), cause the defective of as-cast structure, easy to crack during hot continuous rolling, the thermoplasticity of material is very poor; In addition, Al can be with the SiO in the molten steel
2With the MnO reduction, increase the viscosity of molten steel, destroy the surface and the internal soundness of strand.Therefore, industry thinks that there is very big difficulty in extensive manufacturing of industry of Fe-Mn-Si-Al series high-manganese steel at present, how to study as problem in science, does not still have practical applications and promotes precedent.
Fe-Mn-C is that the TWIP steel is relatively easily smelted than other system, and comprehensive mechanical performance is higher, is the emphasis of developing at present.Arcelor (An Saile) company and TyhssenKrupp (Thyssen Krupp) company have developed the X-IP1000 product at present as the main supplier of global automobile steel, and typical composition is: 0.6C; 23Mn; 0.05～1.0Si, 0～0.008Al, 0.001～0.01N.X-IP1000 tensile strength 1162Mpa, ys 599Mpa, uniform elongation reaches 52.8%, and has very good deep drawability, processability and impact resistance.((method) D Cornette, P Cugy, A Hildenbrand, " the car safety parts are with the strong Fe-Mn TWIP of superelevation steel ", " world steel ", 2006, (3): 39).
Because Fe-Mn-C series high-manganese steel Mn, C content are very high, in the course of hot rolling, crystal boundary is very easy to oxidation when continuous tunnel furnace heat, and κ phase carbide also brings the hot rolled difficulty in the steel, so hot rolling technology is the gordian technique of high mangaenese steel manufacturing.TyhssenKrupp company attempts adopting belt thin strap continuous casting test milling train to produce and produces the high mangaenese steel torrid zone volume that thickness is 6mm, width 300mm; The surface is good with quality of edges; (Karl Heinz Spitzer etc.; " the basic technology technical study of the direct Foundry Production new steel grade of band steel ", " first Sino-German (Europe) metallurgical technology Conference Papers collection ", 212).
Korea S's Posco also is in world lead level to the research of high-manganese steel thin strip continuous casting technology.Patent KR100650559B, KR100650562B disclose the strip continuous casting technology of high mangaenese steel, and produce the good original shape steel band of surface quality, and typical composition is 0.35C, 25Mn, 1.5Al, 0.5Si.The disclosed high mangaenese steel composition of patent KR20040056300 is:＜1.5C, 15～35Mn, 0.1～6.0Al.The Fe-Mn-C series high-manganese steel has HS (ys 599MPa, tensile strength are 1162MPa) and higher unit elongation (52.8%).Around the high-manganese steel thin strip continuous casting technology, patent KR20040055925 discloses the characteristics of crystallization roller; Patent KR20040020465, KR20040020464, KR20040020463, KR20060074638 have set forth technical problems such as the crystallization roller is handled, casting atmosphere, surface quality control.
It is very general to utilize steel scrap to smelt again, contains the Cu element in the steel scrap usually, generally be considered to the harmful element in the steel and control, but for high mangaenese steel, Cu has higher solid solubility as the austenite stable element in austenite.Specifically, the rapid solidification characteristic of CSP, thin strap continuous casting flow process makes the use of Cu element in high mangaenese steel have bigger space.At present, for the thermal treatment process technology of the Fe-Mn-C series high-manganese steel that contains Cu, also there are not relevant patent and report.
Summary of the invention
The object of the present invention is to provide a kind of copper-containing high-strength high-ductility high manganese steel; This kind steel obdurability is high; Be easy to moulding, this steel grade can change under the little situation in tensile strength in the interval annealing of different temperature in addition; Ys and unit elongation change in the larger context, thereby satisfy the specific demand of user.
The present invention is achieved in that a kind of copper-containing high-strength high-ductility high manganese steel; Its composition is by weight percentage: Mn:15%～25%, Cu:0.10%～1.5%, C:0.3%～1.0%, Si:0.04%～0.8%, Al:0.002%～0.8%, surplus are Fe and unavoidable impurities.
The method of manufacture of copper-containing high-strength high-ductility high manganese steel is heated to 0.7T with the copper-containing high-strength high-ductility high manganese steel strand that satisfies mentioned component
L～0.8T
L(T
L: solution treatment under the temperature liquidus temperature of steel), the insulation treatment time is within 3h; The hot rolling start rolling temperature is 0.7T
L～0.8T
L, finishing temperature is 0.6T
L～0.8T
L, air cooling or water-cooled are batched under 550～680 ℃ of temperature; With the steel plate after the hot rolling at anneal between 300～900 ℃ of the temperature, air cooling, or shrend afterwards.
Said hot rolling technology can be single track or multi-pass.
The present invention has relaxed the requirement of Cu element, thereby has reduced raw-material requirement, can utilize copper bearing scrap steel to smelt, and has enlarged the smelting technology scope.If bring the Cu quantity not sufficient in the raw material into; Can also in material, add certain Cu, make Cu content reach 0.10%～1.5%, such Cu content can be regulated the stacking fault energy of material; Thereby regulate distortion of materials mechanism; Optimize the obdurability of material, after suitable annealing process was handled, the Fe-C-Mn series high-manganese steel that the tough long-pending ratio of Cu alloying Fe-C-Mn series high-manganese steel does not add Cu had a more substantial increase.
The minimum content that the present invention has reduced the Mn element requires (15%); Contain Mn amount and can surpass 1000Mpa in 15%～25% steel tensile strength; Unit elongation can make YIELD STRENGTH between 220～600Mpa, change more than 40% through suitable annealing process.And this Steel Alloy constituent content is low, moulding process is required relatively low, the obdurability index with have advantage with the strength specification material compared at present.
The present invention adds than higher C element (0.3%～1.0%); Adding C element can improve the intensity and the unit elongation of material simultaneously; Unit elongation decline is different with general carbon steel raising C element-intensities raising for these, and its reason is that mainly there is mutual effect of dragging in the C-Mn atom.C constituent content of the present invention is limited in below 1.0% simultaneously, can not cause to smelt difficulty.
In addition, copper-containing high-strength high-ductility high manganese steel Si of the present invention, Al content are lower, wherein, Si:0.04～0.8%, Al:0.002～0.8% is smelted with casting relatively easy.
Simultaneously, a spot of Cr, B, N element be can also contain in the steel, the intensity and the erosion resistance that improve material are mainly used in, and crystal grain thinning, the material range of application enlarged.
Copper-containing high-strength high-ductility high manganese steel of the present invention is more stable austenitic matrix, and austenite has the TWIP effect in deformation process, makes material in deformation process, has advantages of higher tensile strength and unit elongation simultaneously.
Solution treatment of the present invention and hot rolling start rolling temperature are 0.7T
L～0.8T
L, select such TR be because, if the too high meeting of temperature makes material oxidation serious, for high mangaenese steel, too high temperature makes material crystal boundary place a large amount of second phases occur, has a strong impact on its performance and properties for follow.The solution treatment soaking time is by the decision of strand size, and size more then soaking time is longer, generally is controlled within the 3h.Because the high mangaenese steel resistance to deformation descends with temperature and improves fast, therefore should under comparatively high temps, accomplish finish to gauge as far as possible, finishing temperature is 0.6T
L～0.8T
L, whole course of hot rolling guarantees fully austenitic structure.
The general high mangaenese steel of final thermal treatment after the hot rolling often adopts high temperature (more than 1000 ℃) solution treatment; Temperature is high, the time is long, the thermal treatment temp of steel grade of the present invention lower (300～900 ℃ are generally being carried out below 700 ℃); Technology is simple, is easy in industrial production, implement.And copper-containing high-strength high-ductility high manganese steel of the present invention is through after the different thermal treatment, and the mechanical property of steel can change within a large range.
The present invention has following beneficial effect: copper-containing high-strength high-ductility high manganese steel of the present invention utilizes the mechanical property of the element alloyed raising high mangaenese steel of Cu; Smelt with casting relatively easy; Austenitic matrix stability is stronger; Have ME window,, the mechanical property of material is changed in the larger context in conjunction with subsequent heat treatment technology than broad.
Copper-containing high-strength high-ductility high manganese steel of the present invention has broad application prospects and potentiality in fields such as locomotive, building, the energy, electric power, is fit to make locomotive chassis, cryogenic liquid tank, locomotive pillar, 3D product casing, bullet train safety component and building stressed member etc.
Embodiment
Embodiment 1:
Composition: 15.8%Mn, 0.6%C, 0.25%Cu, 0.05%Si, 0.01%Al, surplus is Fe and unavoidable impurities.
Method of manufacture:
The steel strand of above composition is heated to solution treatment under 1150 ℃ of temperature, is incubated hot rolling after 4 hours, start rolling temperature: 1100 ℃, finishing temperature: 850 ℃, accumulation draught 80%, coiling temperature is 650 ℃.Hot-rolled sheet thickness 2.5mm.Static tensile test is carried out in sampling (sample sequence number E1).
Tensile strength: 1050Mpa, unit elongation: 50%.
Embodiment 2:
Composition: 15.8%Mn, 0.6%C, 1.0%Cu, 0.08%Si, 0.01%Al, surplus is Fe and unavoidable impurities.
Method of manufacture:
The steel strand of above composition is heated to solution treatment under 1150 ℃ of temperature, is incubated hot rolling after 4 hours, start rolling temperature: 1100 ℃, finishing temperature: 850 ℃, the accumulation draught: 80%, coiling temperature: 600 ℃.Hot-rolled sheet thickness 2.5mm.Behind insulation 20min under 900 ℃, shrend.Static tensile test is carried out in sampling (sample sequence number E2).
Tensile strength: 900～1000Mpa, unit elongation: 62～70%, tough amassing can reach 70,000Mpa%.
Embodiment 3:
Composition: 0.56%C, 15.83%Mn, 0.10%Cu, 0.01%Al, 0.05%Si, 0.005%N, 0.005%B, surplus is Fe and unavoidable impurities.
Method of manufacture:
The steel strand of above composition is heated to solution treatment under 1150 ℃ of temperature, is incubated hot rolling after 4 hours, start rolling temperature: 1100 ℃, finishing temperature: 850 ℃, accumulation draught 80%, coiling temperature: 600 ℃.Hot-rolled sheet thickness 2.5mm.At 300～900 ℃ of 5～60min that anneal down, logical N in the annealing process
2Protection, shrend.Mechanical analysis is carried out in sampling.Table 1 is the mechanical property of measuring behind the annealing 60min.It is thus clear that annealing temperature is very big to the influence of high mangaenese steel.It should be noted that 700 ℃ of annealing down, Tensile strength and unit elongation are constant basically, and ys is reduced to 370Mpa from 520Mpa; 900 ℃ of annealing make Tensile strength that certain decline arranged, and unit elongation reaches 73.5%, and ys has decline slightly, and comprehensive obdurability is best.
The mechanical property of table 1 embodiment 3 high mangaenese steel (annealing 60min)
| The sample sequence number | Temperature ℃ | R p0.2 Mpa | R m Mpa | A ％ | R m×A Mpa％ | R p0.2/R m |
| E3 | 300 | 520 | 1080 | 49.0 | 52,920 | 0.48 |
| E4 | 500 | 520 | 1040 | 49.6 | 51,584 | 0.46 |
| E5 | 700 | 370 | 1040 | 51.5 | 53,040 | 0.36 |
| E6 | 900 | 320 | 850 | 73.5 | 62,475 | 0.38 |
[0038]Table 2 is the relation of annealing time and high mangaenese steel mechanical property.It is thus clear that for low-temperature annealing, annealing time does not have influence basically to performance; High temperature annealing, along with time lengthening, obdurability obviously improves, and yield tensile ratio descends.
Table 3 be sample E3 and Arcelormittal (An Sailemi tal fibre, famous Iron and Steel Production company) ad eundem strength steel performance relatively.It is thus clear that in same intensity rank high-strength steel, the high mangaenese steel unit elongation is 3～5 times of other steel grade, has very significantly performance advantage.
The relation of table 2 embodiment 3 high mangaenese steel mechanical propertys and annealing time
| The sample sequence number | Temperature ℃ | Time min | R p0.2 Mpa | R m Mpa | A ％ | R m×A Mpa％ | R p0.2/R m |
| E7 | 300 | 5 | 530 | 1020 | 56.0 | 57,120 | 0.52 |
| E3 | 300 | 60 | 520 | 1080 | 49.0 | 52,920 | 0.48 |
| E8 | 900 | 5 | 310 | 725 | 57.0 | 41,325 | 0.43 |
| E5 | 900 | 60 | 320 | 850 | 73.5 | 62,475 | 0.38 |
The performance of table 3 embodiment high mangaenese steel and Arcelormittal ad eundem strength steel relatively
| Steel grade | R p0.2 Mpa | R m Mpa | A ％ | R m×A Mpa％ |
| MP1000 | 800-950 | ≥950 | ≥10 | ≥9,500 |
| DP980 | 600-750 | 980～1100 | ≥10 | ≥9,800 |
| TRIP980 | ＞500 | 980～1100 | ≥18 | ≥17,640 |
| E3 (the present invention) | 520 | 1080 | 49.0 | 52,920 |
Embodiment 4:
Composition: 15.1%Mn, 0.6%C, 0.62%Cu, 0.08%Si, 0.01%Al, surplus is Fe and unavoidable impurities.
Method of manufacture:
The steel strand of above composition is heated to solution treatment under 1150 ℃ of temperature, is incubated hot rolling after 4 hours, start rolling temperature: 1100 ℃, finishing temperature: 850 ℃, the accumulation draught: 80%, coiling temperature: 600 ℃.Hot-rolled sheet thickness 2.5mm.Behind insulation 20min under 900 ℃, shrend.Static tensile test is carried out in sampling (sample sequence number E9).
In addition, sample is chosen the high mangaenese steel (sample sequence number E10) that does not add Cu among the embodiment as a comparison, and composition is: Fe-15Mn-0.6C, method of manufacture is with sample E9.The mechanical property of two samples is seen shown in the table 4.Clearly, after identical thermal treatment, contain Cu high mangaenese steel unit elongation and be greatly improved, tough long-pending apparently higher than not adding Cu high mangaenese steel.
Table 4Cu element is to the influence of thermal treatment high mangaenese steel mechanical property
| The sample sequence number | R m Mpa | A ％ | R m×A Mpa％ |
| E9 (containing Cu) | 825 | 72.5 | 59812.5 |
| E10 (not adding Cu) | 835 | 47.0 | 45925.0 |
Embodiment 5:
Composition: 25.0%Mn, 0.3%C, 1.0%Cu, 0.8%Si, 0.8%Al, 0.1%B, 5.0%Cr, surplus is Fe and unavoidable impurities.
Method of manufacture:
The steel strand of above composition is heated to solution treatment under 1150 ℃ of temperature, is incubated hot rolling after 4 hours, start rolling temperature: 1100 ℃, finishing temperature: 850 ℃, the accumulation draught: 80%, coiling temperature: 600 ℃.Hot-rolled sheet thickness 2.5mm.Behind insulation 20min under 900 ℃, air cooling.Static tensile test is carried out in sampling (sample sequence number E11).
Ys: 400Mpa, tensile strength: 745Mpa, unit elongation: 57.5%.
Claims (2)
1. copper-containing high-strength high-ductility high manganese steel; It is characterized in that; Its composition is by weight percentage: Mn:15%～25%, Cu:0.10%～1.0%, C:0.3%～1.0%, Si:0.04%～0.8%, Al:0.002%～0.8%, surplus are Fe and unavoidable impurities;
The copper-containing high-strength high-ductility high manganese steel strand that satisfies mentioned component is heated to solution treatment under 0.7TL～0.8TL temperature, and the insulation treatment time is within 3h; The hot rolling start rolling temperature is 0.7TL～0.8TL, and finishing temperature is 0.6TL～0.8TL, and air cooling or water-cooled are batched under 550～680 ℃ of temperature; With the steel plate after the hot rolling at anneal between 300～900 ℃ of the temperature, air cooling, or shrend afterwards.
2. copper-containing high-strength high-ductility high manganese steel as claimed in claim 1 is characterized in that: said hot rolling technology is single track or multi-pass.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012052626A1 (en) | 2010-10-21 | 2012-04-26 | Arcelormittal Investigacion Y Desarrollo, S.L. | Hot-rolled or cold-rolled steel plate, method for manufacturing same, and use thereof in the automotive industry |
| CN106222554A (en) * | 2016-08-23 | 2016-12-14 | 南京钢铁股份有限公司 | A kind of economical steel used at ultra-low temperature and preparation method thereof |
| CN107523748A (en) * | 2017-09-22 | 2017-12-29 | 河钢股份有限公司 | Ultra-low temperature surroundings high manganese steel sheet and its production method |
| CN110592326B (en) * | 2019-10-17 | 2021-05-07 | 北京科技大学 | Ultra-fine grain steel and industrial preparation method thereof |
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|---|---|---|---|---|
| CN101065503A (en) * | 2004-11-03 | 2007-10-31 | 蒂森克虏伯钢铁股份公司 | High-strength steel strip or sheet exhibiting twip properties and method for producing said strip by direct strip casting |
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| CN101065503A (en) * | 2004-11-03 | 2007-10-31 | 蒂森克虏伯钢铁股份公司 | High-strength steel strip or sheet exhibiting twip properties and method for producing said strip by direct strip casting |
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